At the end of Quantum of Solace, Bond goes to Kazan, Russia, where he confronts Vesper Lynd's former lover, Yusef Kabira. Yusef is a member of the Quantum organization. His role is to seduce high-ranking women with valuable connections, getting them to give up government assets as ransom for himself in fake kidnappings where he is supposedly held hostage.
He is attempting to do the same with Canadian IO Corinne Veneau, even giving her the same kind of necklace (an Algerian love knot) he gave Vesper.
Surprising them at Yusef's apartment, Bond holds the Quantum operative at gunpoint. He tells Corinne about Vesper and advises her to alert CSIS to the leak. She quietly exits, leaving the two men alone, but not before whispering "Thank You." to James Bond, as she realizes how close she came to suffering vesper's fate.